Socioeconomics of Pedestrian Accidents

KSI Pedestrian Dataset

This dataset is a subset of the Killed and Seriously Injured (KSI) dataset collected by the Toronto Police Service from 2008-2018. These events include any serious or fatal collisions where a Pedestrian is involved. To learn more about Pedestrians related collisions in Toronto you can follow this link: http://data.torontopolice.on.ca/pages/pedestrians

We will use the FROM_GeoJson command from the “geojsonR” package to download a json file from the provided URL. The geojson_read command from the “geojsonio” and formating form the “sp” package can then be used to read the json and generate a SpatialPointsDataFrame

json_ped <- FROM_GeoJson("https://opendata.arcgis.com/datasets/3dedc9bff625450990b8d480f397ad3f_0.geojson")
ksi_ped <- geojsonio::geojson_read("https://opendata.arcgis.com/datasets/3dedc9bff625450990b8d480f397ad3f_0.geojson", what = "sp")
head(ksi_ped)

KSI TTC/Municipal Vehicle Dataset

This dataset is a subset of the Killed and Seriously Injured (KSI) dataset collected by the Toronto Police Service from 2008-2018. These events include any serious or fatal collision involving an operator or passenger of a TTC, Transit Vehicle, streetcar or Municipal Vehicle. To learn more about TTC-Municipal Vehicle related collisions in Toronto you can follow this link: http://data.torontopolice.on.ca/pages/ttc-municipal-vehicle

We will use the FROM_GeoJson command from the “geojsonR” package to download a json file from the provided URL. The geojson_read command from the “geojsonio” and formating form the “sp” package can then be used to read the json and generate a SpatialPointsDataFrame

json_ttc <- FROM_GeoJson("https://opendata.arcgis.com/datasets/dc4751278e604d65b0886b9765d4b551_0.geojson")
ksi_ttc <- geojsonio::geojson_read("https://opendata.arcgis.com/datasets/dc4751278e604d65b0886b9765d4b551_0.geojson", what = "sp")
head(ksi_ttc)

Merge KSI_TTC and KSI_Ped

As you will have noticed from the descritpions both the KSI_PED and KSI_TTC datasets are themselves subsets of the Toronto Police Services’ KSI Dataset. We downloaded them as seperate dataframes to enable faster downloads as they make up a small portion of the full KSI dataset, which would take significantly more time to download and sort. Because they come from the same base dataset and have the same schema we can merge them back into one dataframe to work with. We will merge them based on the “Index” to ensure there are no duplicates created due to the merging process.

ksi_merged <- merge(ksi_ped,ksi_ttc, by="Index")

Neighbourhood Boundaries - City of Toronto

The City of Toronto also maintains a list that defines the boundaries of all the neighbourhoods in the city. A file containing the spatial data required to map these neighbourhoods can be downloaded form the City of Toronto open data portal. Due to how this file will download, unlike the KSI data, we cannot directly read the GeoJson file but have to download it before the file can be read.

set_wd <- function() {
  library(rstudioapi) # make sure you have it installed
current_path <- getActiveDocumentContext()$path 
setwd(dirname(current_path))
print( getwd() )
}

download.file("https://ckan0.cf.opendata.inter.prod-toronto.ca/download_resource/a083c865-6d60-4d1d-b6c6-b0c8a85f9c15?format=geojson&projection=4326", destfile = "datasets/Neighbourhoods.geojson", )

trying URL 'https://ckan0.cf.opendata.inter.prod-toronto.ca/download_resource/a083c865-6d60-4d1d-b6c6-b0c8a85f9c15?format=geojson&projection=4326'
Content type 'application/json' length unknown
downloaded 1.9 MB

nbh <- geojsonio::geojson_read("datasets/Neighbourhoods.geojson", what = "sp")

head(nbh)

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Slot "plotOrder":
[1] 1

Slot "labpt":
[1] -79.49605  43.65742

Slot "ID":
[1] "5"

Slot "area":
[1] 0.0001989016



Slot "plotOrder":
[1] 4 5 6 1 2 3

Slot "bbox":
        min       max
x -79.52174 -79.39119
y  43.64744  43.78728

Slot "proj4string":
CRS arguments:
 +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 

Simply Analytics - Census Data

From Simply Analytics i have downloaded shapefiles containing average income by census track and subdivision. These two shapefiles will usefull in drilling down beyond the neighbourhood. Both shapefiles can be uploaded into a spatial dataframe using the st_read command from the “sf” package we installed earlier then converting them to a SpatialPolygonsDataFrame.

cen_shp1 <- st_read("datasets/SimplyAnalytics_C1/C1.shp")

Reading layer `C1' from data source `C:\Users\gvs_j\Documents\GitHub\CSDA-1050F18S1\JacobGVS_304292\sprint_1\Datasets\SimplyAnalytics_C1\C1.shp' using driver `ESRI Shapefile'
Simple feature collection with 572 features and 4 fields
geometry type:  POLYGON
dimension:      XY
bbox:           xmin: -79.6393 ymin: 43.56034 xmax: -79.11347 ymax: 43.85547
epsg (SRID):    4326
proj4string:    +proj=longlat +datum=WGS84 +no_defs

cen_spgdf1 <- as(cen_shp1, "Spatial")
class(cen_spgdf1)

[1] "SpatialPolygonsDataFrame"
attr(,"package")
[1] "sp"

cen_shp2 <- st_read("datasets/SimplyAnalytics_C2/C2.shp")

Reading layer `C2' from data source `C:\Users\gvs_j\Documents\GitHub\CSDA-1050F18S1\JacobGVS_304292\sprint_1\Datasets\SimplyAnalytics_C2\C2.shp' using driver `ESRI Shapefile'
Simple feature collection with 3702 features and 5 fields
geometry type:  POLYGON
dimension:      XY
bbox:           xmin: -79.6393 ymin: 43.56034 xmax: -79.11347 ymax: 43.85547
epsg (SRID):    4326
proj4string:    +proj=longlat +datum=WGS84 +no_defs

cen_spgdf2 <- as(cen_shp2, "Spatial")
class(cen_spgdf2)

[1] "SpatialPolygonsDataFrame"
attr(,"package")
[1] "sp"

Additional Datatables

One additional datatable may be needed depending on how we choose to cluster the KSI data. At a high level grouping accidents to a given neighbourhood as defined by the city then using the census data to further cluster by census track and subdivision will be ideal. I may need to pull the Neighbourhood Profiles data set from the city of Toronto to get an average income level by neighbourhood as this does not appear to be avaialble directly from the census datasets.

KSI_merged Dataset

Lets satrt by getting an idea of where accidents are occuring. The leaflet package will map the data for us. To make this more readable I have had the system autocluster the accidents. These clusters don’t have any relation to specific neighbourhoods and will need to be adjusted later so that the clusters are in line with our other datasets.

leaflet(ksi_merged) %>%
  addTiles() %>%
  addMarkers(lng = ksi_merged$LONGITUDE, lat = ksi_merged$LATITUDE, clusterOptions = markerClusterOptions())

This map will allow you to zoom in and the clusters will auto adjust as you zoom in and out. These clusters are based on proximity to a central point. Once you get to the lowest zoom levels, clicking on a cluster will map the individual accidents. Details for each accident are not currenlty included in the mapping.

Neighbourhood Boundaries - City of Toronto

Our next dataset contains the boundary lines for various neighbourhoods in Toronto. mapping this will begin to give some dimension to how we intend to cluster accidents going forward.

leaflet(nbh) %>%
  addTiles() %>%
  addPolygons()

Simply Analytics - Census Data

We can similarly plot both the census tract and dissemination area files pulled from Simply Analytics.

leaflet(cen_spgdf1) %>%
  addTiles() %>%
  addPolygons()

leaflet(cen_spgdf2) %>%
  addTiles() %>%
  addPolygons()

Our next step will be to assing each accident in the KSI data to a dissemination area polygon.